Vehicle wheel brake shoe



Feb.. 23 1926..

v 1,574yMB6 H. PERROT VEHICLE WHEELBRAKE sHoE Filed April 15 1924 2sheetsfsheet 1 WMM Patented Feb. 23, 1926. l l

PATENT .oFFlcE.

HENRI rEanpr, errants, rnANcE. y

VEHICLE WHEEL BRAKE sBoE.. I

Application led April 15,V 1924. Serial No. 708,929.

To all 'whom t may concern: Be it known that I, HENRI PERROT, a c1t1-zen of France, residing at Paris, France, have invented certain .new anduseful Improvements in Vehicle Wheel Brake Shoes, of which the followingis a description, reference being had-to the accompanying drawing, andto the figures of reference marked thereon,

This invention relates to the construction of brake shoes that are usedmore particularly in connection with the wheels of an automotivevehicle. In the past many of the brake shoes used` internally within abrake drum have been made from castings,

.f such as aluminum or cast iron. It is a wellknown fact that wherevermetal stampings can be used, that these parts can be made lighter andstronger and at the same time cheaper than castings.

It is, therefore, the principal object of my invention to provide alighter stronger and cheaper construction of brake shoes.

In order to illustrate the application of my invention I have. appliedit to a type of brake known in the'automotive trade as lthe Perret-Farman type, in which the brake shoe consists of primary and secondary*members which are pivoted together independent of the'support, but it isto be understood that the construction is applicable to other types ofbrakes than the particular form 'herein shown.

My invention will be clearly understood by reference to the attacheddrawings,l inl Figure 1 is a side elevation of the bra-ke` mechanism ofa wheel, looking from vthel of' the joint mechanism containing theprimary and secondary members of the brake shoes.

Referring now tothe details wherein like numbers refer to correspondingparts in the -various views,A 1 is the axle end of a wheel spindle towhich the brakeV carrier plate 2 is bolted by means of bo1ts3. Plate 2su ports a carrier bracket 4 by means of the hoes 5, 6 and 7. The brakedrum 8 1S adapted to be engaged by braking means comprising a primarybrake shoe 9 anda secondary brake shoe 10, each of which is equippedwith the usual friction material.,

11. The members 9 and 1'0 are pivoted together through the-medium of ajoint 12.

The construction of the members 9 and 1() A is clearly shown in thesection Fig. 2, which indicates a pieceof sheet metal formed to have aweb 13 and flanges 14, in effect producing a hollow or channelconstruction. The web` 13 is adapted to receive the friction material 11in any suitable manner. In order to actuate thebrakn members 9 and 10,the free end of the mem er-9 is equipped with a piece of hard materialsuch as a steel v casting or forging 15, referred to hereinafter as acam follower. The nose 16 is poj sitioned with respect yto the carrierbracket 4 so as to be engaged by the cam 17 that is carried bv acamshaft supported in the carrier bracket 4. The cam follower 15 is soformed that it has portions 18 extending preferably within the flanges14of the mem- -ber 9 and the parts 18 may be fastened to the .flan esI14'in any suitable manner as by .wel ing-or rivets 19. Preferably thecam follower `15 abuts against the end of the channel member 9. In -theconstruction shown in Fig. 4 a at piece of steel may be used'to assistthe cam follower, the flanges of the channel 14 being punched inwardlyto grip thel follower 15, and the whole may be l welded. or rivetedtogether.

At the joint 12.the member 9 is provided with a suitable pivot piece 2l)which4 is fittedv to the channel member 9 in a manner similar to the camfollower, likewise the member 10 is provided with a suitable piece 21 tocomplete the joint 12. The member 21 is also fastened to the member 10inthe same way that 20 is fastened t the primary part 9 of the brakeshoe. The member 21 is provided with an ear 22 to which a spring 23 isattached at one end, the other endl of the spring being attached to therim 24 of the carrier 'plate 2. The spring 23 .helps to withdraw theVbrake shoe from the drum after the cam has been released. The secondarybrake shoe member 10 is pivoted at 25 lto the carrier bracket 4 throughthe medium of a piece 26 that is welded or riveted to the channel member10 in the same way that member'22 1s attached to its opposite end. Thepart 26 is provided with an ear 27 and the can; follower 15 1s providedwith a corresponding ear 28. These ears are provided with a ertureswhich act as attachment points or a spring 29 acting to withdraw thebrake shoes from the drum after 'he cam 17 has been released.

The type of brake shoes illustrated are known to the trade as the servoself-wrapping type, the direction of rotation of the Wheel beingindicated by the arrow Fig. 1, but since my invention merely has to dowith the particular construction of the shoes per se, no furtherdiscussion of the operation of the brake members will be made, except topoint out that the joint 12 may take' other forms, as illustrated inFigs. 5, 6 and 7. In Fig. 5 the joint 12 is of the hinged type in whicha strap member 30 is fastened-to the web 13 in any suitable manner as byrivets 3l, the other part .of the joint being fastened to the member 10in a similar way.y In Fig. (i the joint 12 is completed through a strapmember 32 passing through the flange 14 on the member 9 and a strap 33is fastened to the flange 14 on the member 10, both side flanges beingincluded as a part of the joint. In Fig. 7 a pin. 34 passes through bothof the flanges 14 on both-sides of" members 9 and 10, stop pins 35 beingused to hold .the pin 34 in position. y l From what has been said itwill be ap.

preeiated that my invention is susceptible of numerous chan es and I,therefore, do not wish to be limited except as limited by the scopeofthe appended claims.

' Having thus described my invention, what I claim is: 4

1. A movable braking member for vehicle wheelscomprising a chanilelshaped formed metal member having a cam follower fastened at one end'anda mounting piece at the other end.

2. A movable braking member for vehicle wheels comprising a channelshaped formed steel member vhavin a` cam engaging. piece fastened to oneen and having means at the other end forpivotally mounting said member.

, arestoring spring attachment means.

4. A movable braking member for vehicle wheels comprising a hollowformed metal member having an auxiliary ieee attached to at least oneend thereof, sai `auxiliary piece having an ear lacting as` a ment or arestoring spring.

5. A brake s hoe having spaced tending between .the flanges and havingoppositely-extending thrust'shoulders engag-v ing the ends of theflanges.

a 6.a movable hmmag member if@ whale f point of attachparallel flangesat its end,l and a. separate part exwheels comprising a hollow formedmetal member adapted to have friction material applied thereto andhaving an auxiliary cam engaging piece fastened' to one end and anauxiliary piece forming an articulate joint attached to the other end asdescribed.

8. A movable braking member for vehicleI wheels comprising primary andsecondary members jointed together, said members being pressed fromsheet metal and havinga flat surface for the reception of frictionmaterial, one end of one member having an auxiliary cam engaging piecefastened thereto and one end of the other member having an auxiliarymounting piece fastened thercto, both said pieces having an ear forengagement with opposite ends of the same spring as described.

9. A channel shaped brake shoe having spaced side flanges, with acam-engaging member secured between and reinforcing said Vflanges at oneend of the shoe and having thrust shoulders engaging the ends of theside flanges.

10. A channel' shaped brake shoe of pressed metal having parallel s acedside flanges throughout the length o the shoe, with a cam-engagingmember secured between and reinforcing said flanges at one end ofthe-shoe.

11,. A pressed metal shoe having a recess at one end and a' thrustmember extending into the recess and having thrust shoulders engagingthe end of the shoe.

12. A channel shaped formed metal frictiondevice for a brake having aseparate auxiliary piece secured at each^ end and a retraeting springconnected at its ends to said auxiliarypieces.

13.v A channel shaped formed metal friction device for a brake having aseparate auxiliary piece secured at each end between the `side channelflanges anda retraeting spring connected at its ends to said auxiliarypieces.

llO

14. A channel` shaped formed metal friction device for a brake havingparallel side j atits end secured to both of said side anges'. i

In testimony. whereof, I aix my signature.

PERROT.

